不同温度条件下连铸保护渣矿相结构的研究  

Study of Mineralogical Constitution of Mold Fluxes at Different Temperature

作　　者：孙丽枫[1] 刘承军[1] 姜茂发[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《中国冶金》2008年第2期33-36,60,共5页China Metallurgy

基　　金：国家自然科学基金资助项目(50204005)

摘　　要：采用矿相显微镜及XRD研究了不同温度条件下连铸保护渣矿相结构的变化。结果表明,在本实验条件下的降温和升温过程中,连铸保护渣的结晶化率均随实验温度的升高而下降,结晶矿相主要为枪晶石、硅灰石、黄长石。枪晶石在1000℃和1200℃时结晶能力最强,1300℃时无枪晶石析出。硅灰石只在1000℃时析出,晶体发育程度很高。黄长石晶体在1300℃时发育良好且光学性质明显,1000℃和1200℃时生长缓慢,为细小的颗粒状雏晶。在相同的实验温度条件下,连铸保护渣在升温过程中结晶化率高、晶体细小、结构致密,降温过程中其晶体发育程度良好、晶体粗大。The mineralogical constitution of mold fluxes was investigated at the different temperature by TEM and XRD. The results shown that with increasing of experimental temperature, the crystallization ratio of mold fluxes was decreased both during cooling and heating-up, the major crystal phase of mold fluxes were cuspidate, wollastonite and melilite. The crystallization ability of cuspidate was the best at 1000 ℃ and 1 200 ℃, but it couldn＇t be precipitated at 1 300℃. Wollastonite with perfect crystal texture was only precipitated at 1 000 ℃. Melilite presented obvious the optical properties and developed crystal at 1 300 ℃, however it was the small grain crystallite because of slow crystal growth at 1000 ℃ and 1 200 ℃. At same experimental temperature, the solidification structure of mold fluxes was dense that had the higher crystallization ratio and small crystal size during heating-up, in addition the crystal growth of mold fluxes was better that had stronger crystal during cooling.

关 键 词：连铸保护渣 渣膜 矿相结构 

分 类 号：TF777[冶金工程—钢铁冶金]